挖掘机论文中英文资料外文翻译文献Word文件下载.docx

1、挖掘机论文中英文资料外文翻译文献#挖掘机论文中英文资料外文翻译文献#外文文献#A Summary of Small-size Excavators Home and Abroad#I. The brief introduction of hydraulic excavator#Parts such as the hydraulic excavator is by engine, hydraulic system and works device and walks device and electric control etc are formed. The hydraulic system

2、is formed by hydraulic pump, control valve, hydraulic cylinder, hydraulic pressure motor, pipe route and fuel tank etc. The electric control system includes supervision dish, motor control system, pump brain and various kinds of sensor and solenoid valves etc. The hydraulic excavator is general by t

3、he work device and turns round the device and walks device three is mostly formed. According to his construction and use, we can differentiate :# many kinds of types such as caterpillar tread type, tyre type, walk type, full hydraulic pressure, half hydraulic pressure, turns round entirely, not turn

4、s round entirely, utility version, mould for a special purpose, the joining with a hinge type and arm type stretched out and drawn back etc. #The work device is directly accomplishing the device that excavates the assignment. It has been joined with a hinge by moves the arm, fights the pole and shov

5、els the fill etc three parts. Moving that the arm rises and falls and the pole fought stretches out and draws back and shoveling fighting moves all with moving back and forth type two effect hydraulic cylinders control. In order to suit the needs of various difference construction school assignments

6、, the hydraulic pressure excavator can be joined in marriage loading many kinds of work devices, if excavating and many kinds of school assignment machines and tools such as lifting job, loading, leveling, clamp and pushes soil and shock hammer etc. #Turning round and walks the device is the organis

7、m of hydraulic pressure excavator, upper setting up power-on device and transmission system of turntable. The engine is the power supply of hydraulic pressure excavator, and adopts diesel oil will also can modify the electromotor in the convenient place mostly. #The hydraulic drive system by way of

8、the hydraulic pump with the engine the motive force transmission to hydraulic pressure motor and hydraulic cylinder etc actuator, the promotion work device moves, thus accomplishes the various school assignments. Take more PV-200#s mould hydraulic pressure excavators of use in building site as the e

9、xample. This machine adopts the type the opening center load of advanced version to be passed feeling system （OLSS）. This system is with oblique of control type oblique the method of angle （export volume of flow ） variable plunger pump, and reduced the power delivery of engine, thus reduces the oil

10、consumption burnt, and is one kind of saving energy mould system. The characteristic of this kind of hydraulic system is:# the fixed torque is controlled, and it is unchangeable to keep the hydraulic pump drive torque, and year absolutely control can reduce the off-loading loss of school assignment

11、time;# Oil capacity is controlled, and the export volume of flow of hydraulic pump in the time of can reducing neutral gear and fine control reduces the power loss. #The history of the first hand excavator was published up to now to have more than 130 years, and went through from the steam drive fil

12、l to turn round that the machinery turns round the developing the course step by step of the complete automatic hydraulic pressure excavator of excavator and application mechanical and electrical liquid integration technology to power drive and the internal-combustion engine drive in the time. The a

13、pplication owing to the hydraulic technique had to join in marriage on the tractor loading hydraulic pressure to anti- the type hanging which shoveled machinery in the 1940s, and developing out the pulling type at the initial stage of in the 1950s with middle period in succession, to turn round the

14、full hydraulic pressure of hydraulic pressure excavator and caterpillar tread type entirely mechanical. Initial stage the trial hydraulic pressure excavator is the hydraulic technique that adopts plane and machine tool, lacking the hydraulic pressure component that is suitable in the mechanical vari

15、ous operating modes, it is stable inadequately to make the quality, and necessary is not completely yet. From in the 1960s, the hydraulic pressure excavator is entered the popularization and in vigorous development stage, and mechanical manufacturing plant and the breed of each country increases ver

16、y fast, and the output is rapidly increased. 83% of the mechanical gross output was occupied to hydraulic pressure excavator output, and is close to 100% at present 1968-1970 certain period. #Small excavator development and its tendency#20th century 80 90#s small mechanical device in construction and soon in municipal engineering, transportation, pipeline has displayed abigger superiority and can rapidly develop. The small excavator forsaved the manpower, the physical resourc